Forget about that, there is a fuse on board which might trip at 1.1A!
Any well designed 5V 1A power supply with an USB output port, and/or with an mini USB output cable should be fine to power the PI, and have some reserve. The wiki list suitable and unsuitable devices. But for powering the WiFi adapter you most often (some people claim they used an wifi adapter directly on the PI) would need a powered hub, and regarding the VGA adapter, you have another problem, as there is also a diode in-between the PI and the HDMI output to prevent the HDMI device from attempting to power the PI, and that diode is rated just 200mA. Using an 1A PSU, and no wifi adapter you might be able to power the VGA adapter, or you might not, depending on exactly how much power it draws, if you are unlucky it won't work, if you are even more unlucky it will also blow up the fuse, which takes days to recover somewhat and/or will blow out the diode.
There are reasons why using an self powered VGA adapter is strongly advised, and why the FAQ says that anything beyond a mouse and keyboard needs a powered hub, for power as much as for expanding the number of ports.